I understand that there is only 1 HS code allowed for a HBL filing. How if my HBL contains multiple items and HS codes?

I understand that there is only 1 HS code allowed for a HBL filing. How if my HBL contains multiple items and HS codes?

Filers should choose representative one. Price or quantity can be yardstick. Please be noted that in this case they should enter multiple items’ name in the Goods Description field as many as possible within 350 characters.